linux-kernel - Re: 2.6.25 and DEBUG_SECTION

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Message-ID: <20080416210838.GA27459@elte.hu>
Date:	Wed, 16 Apr 2008 23:08:38 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Adrian Bunk <bunk@...nel.org>, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.25 and DEBUG_SECTION_MISMATCH


* Sam Ravnborg <sam@...nborg.org> wrote:

> On Wed, Apr 16, 2008 at 09:55:04PM +0200, Ingo Molnar wrote:
> > 
> > * Ingo Molnar <mingo@...e.hu> wrote:
> > 
> > > * Sam Ravnborg <sam@...nborg.org> wrote:
> > > 
> > > > I would prefer we were down to less than 5 warnings so we could 
> > > > enable it in kconfig but maybe after next merge window.
> > > 
> > > they get regenerated. More than 1 out of every 100 new patches. Quite 
> > > expensive feature (in terms of maintenance overhead) for a rather 
> > > theoretical memory saving benefit.
> > 
> > in v2.6.24 we had at least 200 section fixes:
> > 
> >   $ git-log v2.6.24.. | egrep -c 'WARNING:.*Section mismatch'
> >   198
> > 
> > for 12671 commits - that's 1 section type fix for every 60 commits.
> Please get your numbers right. What you count is the number of Section 
> mismatch warnings that has been fixed. Sometime fixing up one line of 
> code fixes >5 section mismatch warnings.

the revised number is: at least 84 commits that fixed section bugs. 
That's still rather large.

> > and 90% of the problems could be reduced via the very simple patch 
> > below ...
> > 
> > so ... why shouldnt we say that if someone wants to have this 
> > feature, it should be done all automatically, in the link space. 
> > There's no reason why the dependencies couldnt be figured out all 
> > automatically.
> 
> Or we could fix the blatant misuse of __cpuinit. If has replaced a 
> proper separation of code that is only relevant for CPU hotplug and 
> code that is used with and without CPUHOTPLUG.
> 
> I question that we have 580 functions that is used duing init in 
> normal cases and during CPU hotplug.

sure, if you can solve it, please do - but the stream of new section 
warnings and seems somewhat worrying for the long run.

	Ingo
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